Improvement in temperature-alarms



UNITED STATE-s .PATENT OFFICE.

IOBERT BOYLE, OF DETROIT, MICHIGAN Specification forming pnr't of Letters Patent No. 39,794, dated September-S, 1863.

To all @cham fit may concern:

Be it known that I, Ronnnjr Borna, of Detroit, in the county of Wayne and State ot' Michigan, have inventeda new and Improved Temperature-Alarm 5 and I do hereby declare that the following is a full, clear, and exact ,description of the same, reference being had ofthe accompanying drawings, making a part .if this specification, in whichv Figure 1 represents an elevation of my device. with the necessary connections in working order. Fig. 2 is a plan on top view ofthe same. f Similar letters of reference in both views indicate corresponding parts.

The invention consists in the arrangement of an oscillating index operated upon by a iioat projecting` from a tube partially lled with mercury or other suitable liqj. 1id,` andoperating between a gate or two stopsthat are adjnstableupon a graduated arc, in combination 'with an electro-magnetic hammer operating upon a suitable alarm-bell-in such a manner that when the temperature in the room or spacewhere the apparatus is put up rises above vor sinks below a certain point the oscillating index, by the expansion or contraction of the. mercury in the tube andconsequent rising or falling of the tioat, is brought in contactwith either ot the stops o n the graduated arc, and thereby the circuit ot' the electro-magnetic alarm is closed and the hammer is caused to sound the alarm-bell.

To enable others skilled in theart to make" -and use my invention, I will proceed to describe its construction and operation with reference to the drawings. l'

A represents aboard or frame, provided with a loop, a, so that it can be conveniently suspended from -the walls ot' a house, or it may be arranged in any other desirable manner, so that it can be putv up in the place where the instrument is to be used. Secured on the surface of this frame onboard is a tube, B,'of

glass or any other suitable material, which is partially iilled with mercury or 'other suitable `ture causes a considerable rise and fall of the mercury in the tube, and consequently ofthe oat CJ This iioat consists of a cylindrical piece of wood or other suitable material, and its top end' may oe provided with a notch to receive the index, which is made of a piece ot' copper wire or other good conductor of electricity, and which is fulcrated on a pin or stud, c, that rises from lthe frame A. Said index moves over an are, E, which is made of sheetbrass or other good conductor ofy electricity7 which projects above the surface ot' the frame A,'and which supports the vindex D, so that the same does not come in contact with Vthe graduated metal are E. The 'point of the index D is ccntined between a gate; G, which is adjustable on the metal arc E, by means of a clasp, d, and which extends over or straddles thirty (more or less) degrees of the scale on the graduated arc. Instead of the gate G, however, two separate stops may he used, each of which can beAadjust-ed ontho graduated arc, so that the number of degrees situated between them can be varied at pleasure.

H represents Athe electromagn etic alarm, which consists of the hammer e, alarm-'bell f, helix 7L, armature ,'key k, and anvil l. The armature swings oil a pivot fastened in the platform which supports the whole device, and the hammercis connected to said armature by. a stem, e'. Thejkeyk extends from thearmature over the anvil Z, and its front end is secured in a small plate, k', of ivory or other nonconductor of electricity, so that an electric contact between the key and tue anvil is prevented. A spiral spring, m, attached to the key 7c draws the armature back from the core of the helix It, and the bell fis so situated that the hammer c strikes it wherever the armature is attracted by the core of the helix.

The connections of the several parts ot my instrument with each-other and with the bat-4 teryand the operation are as ollowsz.

The stud c connects by a wire, l0, with onesay the positive-pole of the battery, and the negative pole ot' the battery connects bya wire, Ill,` with one end ofthe helix. .The other end, .13, of the helix is fastened to the plate Itv in such4 a manner that when said plate is down upon' the anvil the end of the helix is in metallic contant with the anvil or with a portion oi the anvil. A wire, 12, leading from the lgraduated arc Eto the anvil i, completes the connection. The gateGis adjusted on the arc/ E so that the point of the index cannot/riso vvare E, wire above nor sink down below certain points on said arc without comin g` irl-contact with a por tion of the gate. 1f the vtemperature of the atmosphere surrounding the tube B now rises high enough to bring the point of the index in contact with the upper ,part of the gate, or if the temperature'sinks so low that the point of the index touches the lower part ofthe gate, the current is closed, passing from the battery through the wire l0, stud c, index D, gate G, i2, auvii l, wire. 13, helix h, and through wire 1l baokto the battery. The armature is attracted and the hammer strikes the bell. 'As soon as the armature is attracted the metallic contact between the wire 13 and the anvil is interrupted and the current is broken, the armatiire, with the hammere, recedes, the current is again closed, the hammer strikes again, and the alarm is sounded as long as the index D remains in contact with the gate.

' 'This invention is applicable as a fire-alarm `in private buildings, in warehouses, 'in facto ries, or onboard ot vessels, and it is particularly useful as temperaturealarm in greenhouses or other places where it is desirable to l maintain a uniform temperature. If used in a green-house, the frame A, with tube B and index D, is put up in the interior ofthe house, andthe alarm is placed in the room of' .the attendant, the connections heingm'ade substantially in the manner previously described.,

The gate Gis set so as to permit the index to oscillate between the desired. limits. If by some accident the temperature rises above or falls below a certain point, the alarm issonnded, and the attendant can remedy the evil before any damage has been done. The same remark applies to dryin g-houses,chemical laboratories,

and many other places where it is desirable to maintain ya uniform temperature, and where it is equally obiectionable if the temperature sinks below as it isit' it rises above acertain point.

When used as a fire-alarm the gate-G must be so arranged that the electrio'current is closed only when the temperature, and with it the index, rises to a certain point, and consequently the alarm isonly sounded when that v point is reached, but it must not be sounded when the temperature sinks.' I do not claim, broadly, the empioyment of' an electro-magnetic apparatns'in connection withV a temperature-alarm 5 `but,

Having thus fully described my invention, what I claim as new, and desire to secure by Letters latent, is'-I l The combination of the gate G, graduated are E, and electric alarm H with the index D, oat C, and mercury-tube B, inthe manner herein shown and described.

ROBERT BGYLE. i Witnesses:

BELA HUBBABD, JULrUs SroLL. 

